Carp most likely

agreed, I'm thinking mirror carp

Carp? Maybe drum? It be a little easier if we knew where you found it. Salt? Fresh? River? Lake?

Redfish?

Buffalo.

Seems like grass carp, or common carp

Pirarucu

Freshwater or saltwater? How large was it? That looks like a carp or tarpon scale.

My friend, I have no idea